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High-temperature-resistant low-tension foam oil-displacing agent and application thereof

A technology of foam flooding and low tension, which is applied in the field of foam flooding agents, can solve the problems of poor stability and insufficient foam flooding in high-temperature reservoirs, and the foam agent does not have ultra-low interfacial tension, so as to achieve easy large-scale use and increase Effects of foam stabilizing performance, solubility performance and strong high temperature resistance performance

Inactive Publication Date: 2015-07-01
丁国良
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] An object of the present invention is to solve the problem that the above-mentioned foaming agent does not have ultra-low interfacial tension, and its poor stability cannot meet the needs of foam flooding in high-temperature reservoirs, thereby providing a foaming agent with ultra-low interfacial tension, strong foaming ability, and good foam stability. It has good high temperature resistance, low tension foam oil displacement agent with high temperature resistance and can improve oil recovery in oil reservoirs

Method used

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  • High-temperature-resistant low-tension foam oil-displacing agent and application thereof
  • High-temperature-resistant low-tension foam oil-displacing agent and application thereof
  • High-temperature-resistant low-tension foam oil-displacing agent and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Prepare an aqueous solution of a low-tension foam oil displacement agent with high temperature resistance, wherein the mass concentration of sodium tetradecyl α-olefin sulfonate in the aqueous solution is 1.0‰, and the mass concentration of sodium tetradecylbenzenesulfonate is 1.0 ‰, the mass concentration of cetyl betaine is 2.0‰ (mass concentration of anionic surfactant: mass concentration of zwitterionic surfactant=1:1), the mass concentration of sodium chloride is 0.1‰, dodecyl alcohol The mass concentration is 0.1‰.

[0041] The above-mentioned low-tension foam oil displacement agent with high temperature resistance does not decompose at a high temperature of 300°C.

[0042]Take 50 mL of the aqueous solution of the low-tension foam oil-displacing agent with high temperature resistance and pour it into the airflow foam instrument, keep the temperature at 50°C for 30 minutes; use a peristaltic pump at a constant speed (10mL / s) to ventilate the air from the lower part...

Embodiment 2

[0044] Prepare an aqueous solution of a low-tension foam oil displacement agent with high temperature resistance, wherein the mass concentration of sodium dodecyl α-olefin sulfonate in the aqueous solution is 50‰, and the mass concentration of sodium dodecylbenzenesulfonate is 50‰ ‰, the mass concentration of dodecyl betaine is 2.0 ‰ (the mass concentration of anionic surfactant: the mass concentration of zwitterionic surfactant=50:1), the mass concentration of sodium chloride is 15 ‰, calcium chloride The mass concentration of tetradecyl alcohol is 1‰, and the mass concentration of myristyl alcohol is 3‰.

[0045] The above-mentioned low-tension foam oil displacement agent with high temperature resistance does not decompose at a high temperature of 300°C.

[0046] Take 50 mL of the aqueous solution of the low-tension foam oil-displacing agent with high temperature resistance and pour it into the airflow foam instrument, keep the temperature at 50°C for 30 minutes; use a peris...

Embodiment 3

[0048] Prepare an aqueous solution of a low-tension foam oil displacement agent with high temperature resistance, wherein the mass concentration of sodium cetyl sulfonate in the aqueous solution is 1.7‰, the mass concentration of sodium octadecylbenzene sulfonate is 1.7‰, ten The mass concentration of octaalkyl betaine is 2.0‰ (the mass concentration of anionic surfactant: the mass concentration of zwitterionic surfactant=1.7:1), the mass concentration of sodium chloride is 5‰, the mass concentration of calcium chloride is 1.5‰, and the mass concentration of stearyl alcohol is 0.5‰.

[0049] The above-mentioned low-tension foam oil displacement agent with high temperature resistance does not decompose at a high temperature of 300°C.

[0050] Take 50 mL of the aqueous solution of the low-tension foam oil-displacing agent with high temperature resistance and pour it into the airflow foam instrument, keep the temperature at 50°C for 30 minutes; use a peristaltic pump at a constan...

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Abstract

A high-temperature-resistant low-tension foam oil-displacing agent comprises an anionic surfactant and a zwitterionic surfactant, wherein the mass concentration ratio of the anionic surfactant to the zwitterionic surfactant is (1-50):1. The invention further discloses an application of the high-temperature-resistant low-tension foam oil-displacing agent to tertiary oil recovery to increase the recovery efficiency of crude oil in a high-temperature oil reservoir with the formation temperature of 80-200 DEG C. The high-temperature-resistant low-tension foam oil-displacing agent provided by the invention has the characteristics of ultralow interfacial tension, high foaming capacity, good foam stabilizing effect, good high-temperature resistance and the like, cannot be decomposed at the high temperature of 300DEG C. Ultralow interfacial tension less than 10<-2>mN / m can be achieved between an aqueous solution of the high-temperature-resistant low-tension foam oil-displacing agent and crude oil, wherein the concentration of the aqueous solution of the high-temperature-resistant low-tension foam oil-displacing agent is 0.1-0.5wt%.

Description

technical field [0001] The invention relates to a foam oil-displacing agent for improving the oil recovery rate of oil reservoirs. More specifically, it relates to a high-temperature-resistant low-tension foam oil displacement agent for enhancing oil recovery in oil reservoirs and its application. Background technique [0002] With the deepening of oil exploration and development, more than 30 of the world's largest oil fields have entered the stage of high water cut or even ultra-high water cut development. People are paying more and more attention to improving the oil recovery of these old oil fields. Tertiary oil recovery technology to increase the recoverable reserves of crude oil. Among them, the low-tension foam flooding technology is the most eye-catching and the most promising oil recovery technology under the current situation. It can not only fully tap the oil flooding potential of surfactants, but also use the selective adjustment of foam to increase the swept vo...

Claims

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Application Information

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IPC IPC(8): C09K8/584
Inventor 丁国良
Owner 丁国良
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